Substantial expansion of Arctic

Trilogy Metals Inc. April 25 reported that the Arctic deposit at its Upper Kobuk Mineral Projects in Northwest Alaska now contains 2.4 billion pounds of copper and 3.4 billion lb of zinc in the indicated resource category, a roughly 40 percent increase for both metals.

At a 0.5 percent copper-equivalent cut-off grade, the Arctic deposit is estimated to contain in-pit 36 million metric tons of...